Why won't Apple's original 1TB SSD fit in my JDM 855/825 enclosure? Category : Compatibility To allow for higher capacity, Apple has widened the PCB for its 1TB SSDs, so that compared to Apple's other SSDs, the 1TB SSD comes larger in size. This is why the original 1TB SSD from Apple won't fit in the JetDrive 855/825 enclosure. Is the answer helpful? Related JetDrive fails to restore operating system and the partition of the original drive is grayed out. What can I do? Why is the performance of my JDM820/825 lower than specified? After cloning Mac OS, I can't log in with original password. Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started